/*
 *  Copyright 2004 Blandware (http://www.blandware.com)
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */
package com.blandware.atleap.webapp.action.core.user;

import com.blandware.atleap.common.Constants;
import com.blandware.atleap.model.core.User;
import com.blandware.atleap.service.core.GroupManager;
import com.blandware.atleap.service.core.RoleManager;
import com.blandware.atleap.service.core.UserManager;
import com.blandware.atleap.webapp.action.core.BaseAction;
import com.blandware.atleap.webapp.form.core.SelectRolesAndGroupsForm;
import com.blandware.atleap.webapp.util.core.WebappConstants;
import com.blandware.atleap.webapp.util.core.WebappUtil;
import org.apache.struts.action.*;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.ArrayList;
import java.util.List;

/**
 * <p>Returns page with two lists to reassign roles to user and two lists to
 * reassign groups to user
 * </p>
 * <p><a href="CallAssignUserRolesAndGroupsAction.java.html"><i>View Source</i></a></p>
 * <p/>
 *
 * @author Sergey Zubtsovskiy <a href="mailto:sergey.zubtsovskiy@blandware.com">&lt;sergey.zubtsovskiy@blandware.com&gt;</a>
 * @version $Revision: 1.6 $ $Date: 2006/08/03 10:08:02 $
 * @struts.action path="/core/user/callAssignRolesAndGroups"
 * name="selectRolesAndGroupsForm"
 * validate="false"
 * roles="core-user-assignRolesAndGroups"
 * @struts.action-forward name="assignRolesAndGroups"
 * path=".core.user.assignRolesAndGroups"
 * @struts.action-forward name="listUsers"
 * path="/core/user/list.do"
 * redirect="true"
 */
public final class CallAssignUserRolesAndGroupsAction extends BaseAction {
	/**
	 * @param mapping  The ActionMapping used to select this instance
	 * @param form     The optional ActionForm bean for this request (if any)
	 * @param request  The HTTP request we are proceeding
	 * @param response The HTTP response we are creating
	 * @return an ActionForward instance describing where and how
	 *         control should be forwarded, or null if response
	 *         has already been completed
	 */
	public ActionForward execute(ActionMapping mapping, ActionForm form,
	                             HttpServletRequest request, HttpServletResponse response) throws Exception {

		String userName = null;
		if ( request.getParameter("userName") != null ) {
			userName = request.getParameter("userName");
		} else if ( request.getAttribute(WebappConstants.USER_NAME_KEY) != null ) {
			userName = (String) request.getAttribute(WebappConstants.USER_NAME_KEY);
		} else {
			if ( log.isWarnEnabled() ) {
				log.warn("Missing user name. Returning to list...");
			}
			return mapping.findForward("listUsers");
		}

		SelectRolesAndGroupsForm selectRolesAndGroupsForm = (SelectRolesAndGroupsForm) form;
		UserManager userManager = (UserManager) getBean(Constants.USER_MANAGER_BEAN);
		User user = userManager.retrieveUser(userName);

		if ( user == null ) {
			// user not found. it might be deleted by someone else
			ActionMessages errors = new ActionMessages();
			errors.add("userNotFound", new ActionMessage("core.user.errors.notFound"));
			saveErrors(request, errors);
			return mapping.findForward("listUsers");
		}

		selectRolesAndGroupsForm.setVersion(user.getVersion().toString());

		List userRoles = new ArrayList(user.getFreeRoles());

		RoleManager roleManager = (RoleManager) getBean(Constants.ROLE_MANAGER_BEAN);
		List availableRoles = new ArrayList(roleManager.listRoles(null));
        List allRoles = new ArrayList(availableRoles);
		availableRoles.removeAll(userRoles);

		selectRolesAndGroupsForm.setAvailableRolesList(availableRoles);
		selectRolesAndGroupsForm.setSelectedRolesList(userRoles);

		List userGroups = new ArrayList(user.getGroups());

		GroupManager groupManager = (GroupManager) getBean(Constants.GROUP_MANAGER_BEAN);
		List availableGroups = new ArrayList(groupManager.listGroups(null));
        List allGroups = new ArrayList(availableGroups);
		availableGroups.removeAll(userGroups);

		selectRolesAndGroupsForm.setAvailableGroupsList(availableGroups);
		selectRolesAndGroupsForm.setSelectedGroupsList(userGroups);

		request.getSession().setAttribute(WebappConstants.USER_NAME_KEY, user.getName());
        allRoles = WebappUtil.prepareRolesListForJs(allRoles);
        allGroups = WebappUtil.prepareGroupsListForJs(allGroups);
        request.setAttribute("allRoles", allRoles);
        request.setAttribute("allGroups", allGroups);

		// save transaction token in request
		saveToken(request);
		return mapping.findForward("assignRolesAndGroups");
	}
}